kahun/awesome-sysadmin — pull request #145 by lenn4rd (2014-06-29 14:41:01+00:00)
Title: Add OpenSSL Cookbook to Books

I'm not entirely sure if the OpenSSL Cookbook belongs on this list since it's free but not open source. I checked a few other items under Resources and some seem to just be free, too. Feel free to deny my pull request if you don't see fit.